It was considered as the big test for the future of live music as 5000 fans came together to watch a gig together with no social distancing.
All attendees were tested in advance and masks were required at all times, unless eating and drinking in designated areas.
The event was organised by a number of groups including the people behind Barcelona's Sonar Festival and Ventura Barbra spoke to Dermot and Dave with an explanation of how it all worked.
Since then, those who attended the gig have been tested and the results are in.
Ventura, and Doctor Josep Maria Llibre, specialist in infectious diseases of the research group of the Germans Trias y Pujol Hospital from Barcelona and who was in charge of the study joined Dermot and Dave with some promising results.
You can catch the chat in full by clicking play below:
